linux-kernel - Re: [PATCH v2 1/2] smaps: fill missing fields for vma(VM

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Message-ID: <alpine.DEB.2.10.1508111647110.1853@chino.kir.corp.google.com>
Date:	Tue, 11 Aug 2015 16:48:56 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Naoya Horiguchi <n-horiguchi@...jp.nec.com>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Jörn Engel <joern@...estorage.com>,
	Mike Kravetz <mike.kravetz@...cle.com>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Naoya Horiguchi <nao.horiguchi@...il.com>
Subject: Re: [PATCH v2 1/2] smaps: fill missing fields for vma(VM_HUGETLB)

On Tue, 11 Aug 2015, Naoya Horiguchi wrote:

> > This memory was not included in rss originally because memory in the 
> > hugetlb persistent pool is always resident.  Unmapping the memory does not 
> > free memory.  For this reason, hugetlb memory has always been treated as 
> > its own type of memory.
> 
> Right, so it might be better not to use the word "RSS" for hugetlb, maybe
> something like "HugetlbPages:" seems better to me.
> 

When the pagesize is also specified, as it is in smaps, I think this would 
be the best option.  Note that we can't distinguish between variable 
hugetlb sizes with VmFlags alone.
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